That depends on their relationship. Devika is already getting more emotions than she should. The further apart they are the more she will feel. They shouldn't be more than a room apart. So sleeping in separate rooms wouldn't be a problem. But if Roxy were to go down stairs and work she wouldn't know where Devika would be. If Roxy was in the front of the house and Devika was in the back it could be a problem. Roxy isn't willing to take that chance. As they get closer the shield should improve allowing them to be further apart and Devika only to feel emotions of others if and when she chooses too.